- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我正在使用 FFMPEG 制作包含单个单色 JPG 图像的视频:
ffmpeg -y -loop 1 -framerate 30 -t 5 -i SplashBW.jpg Splash.mp4
Film and TV
播放视频时看到的屏幕记录。应用程序。
C:\Users\Raymond\Desktop\Chorus\Videos\Virtual Choir>call ffmpeg -y -loglevel verbose -loop 1 -framerate 30 -t 5 -i SplashBW.jpg Splash.mp4
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20200122
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libope
ncore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --
enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuv
id --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
libavutil 56. 31.100 / 56. 31.100
libavcodec 58. 54.100 / 58. 54.100
libavformat 58. 29.100 / 58. 29.100
libavdevice 58. 8.100 / 58. 8.100
libavfilter 7. 57.100 / 7. 57.100
libswscale 5. 5.100 / 5. 5.100
libswresample 3. 5.100 / 3. 5.100
libpostproc 55. 5.100 / 55. 5.100
[AVIOContext @ 000001e6f6ccdd00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6ccde80] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6d59b00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6ccde40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6ccdf00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6ccdfc0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cce180] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cce240] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd33c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd3480] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd3640] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd3700] Statistics: 159785 bytes read, 0 seeks
Last message repeated 19 times
Input #0, image2, from 'SplashBW.jpg':
Duration: 00:00:00.03, start: 0.000000, bitrate: 38348 kb/s
Stream #0:0: Video: mjpeg (Baseline), 1 reference frame, gray(bt470bg/unknown/unknown, center), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 30 tbn, 30 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[graph 0 input from stream 0:0 @ 000001e6f6cd2ec0] w:1920 h:1080 pixfmt:gray tb:1/30 fr:30/1 sar:1/1 sws_param:flags=2
[libx264 @ 000001e6f6d57100] using SAR=1/1
[libx264 @ 000001e6f6d57100] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001e6f6d57100] profile High, level 4.0, 4:0:0, 8-bit
[libx264 @ 000001e6f6d57100] 264 - core 159 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chro
ma_me=0 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weigh
tb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'Splash.mp4':
Metadata:
encoder : Lavf58.29.100
Stream #0:0: Video: h264 (libx264), 1 reference frame (avc1 / 0x31637661), gray(center), 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 30 fps, 15360 tbn, 30 tbc
Metadata:
encoder : Lavc58.54.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
[AVIOContext @ 000001e6f8b98e00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5980] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeksspeed= 0x
[AVIOContext @ 000001e6f6cd5580] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks1.0kbits/s speed=0.359x
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5580] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5580] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks0.3kbits/s speed=0.828x
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5580] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5580] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd51c0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5580] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5840] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks0.2kbits/s speed=1.16x
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
Last message repeated 2 times
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5300] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5440] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5700] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5980] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
Last message repeated 1 times
[AVIOContext @ 000001e6f6cd5040] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd4f00] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5c40] Statistics: 159785 bytes read, 0 seeks
[AVIOContext @ 000001e6f6cd5ac0] Statistics: 159785 bytes read, 0 seeks
No more output streams to write to, finishing.
frame= 150 fps= 51 q=-1.0 Lsize= 142kB time=00:00:04.90 bitrate= 237.8kbits/s speed=1.65x
video:140kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.855892%
Input file #0 (SplashBW.jpg):
Input stream #0:0 (video): 151 packets read (24127535 bytes); 151 frames decoded;
Total: 151 packets (24127535 bytes) demuxed
Output file #0 (Splash.mp4):
Output stream #0:0 (video): 150 frames encoded; 150 packets muxed (143004 bytes);
Total: 150 packets (143004 bytes) muxed
[AVIOContext @ 000001e6f6d59240] Statistics: 2 seeks, 4 writeouts
[libx264 @ 000001e6f6d57100] frame I:1 Avg QP:18.13 size:131209
[libx264 @ 000001e6f6d57100] frame P:38 Avg QP:16.03 size: 87
[libx264 @ 000001e6f6d57100] frame B:111 Avg QP:24.33 size: 70
[libx264 @ 000001e6f6d57100] consecutive B-frames: 1.3% 0.0% 0.0% 98.7%
[libx264 @ 000001e6f6d57100] mb I I16..4: 1.8% 96.0% 2.2%
[libx264 @ 000001e6f6d57100] mb P I16..4: 0.0% 0.0% 0.0% P16..4: 0.0% 0.0% 0.0% 0.0% 0.0% skip:99.9%
[libx264 @ 000001e6f6d57100] mb B I16..4: 0.0% 0.0% 0.0% B16..8: 0.0% 0.0% 0.0% direct: 0.0% skip:100.0% L0:21.7% L1:78.3% BI: 0.0%
[libx264 @ 000001e6f6d57100] 8x8 transform intra:96.0% inter:98.7%
[libx264 @ 000001e6f6d57100] coded y intra: 94.7% inter: 0.0%
[libx264 @ 000001e6f6d57100] i16 v,h,dc,p: 24% 37% 5% 34%
[libx264 @ 000001e6f6d57100] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 22% 11% 3% 3% 3% 4% 3% 5%
[libx264 @ 000001e6f6d57100] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 79% 9% 2% 1% 2% 1% 4% 1% 1%
[libx264 @ 000001e6f6d57100] i8c dc,h,v,p: 100% 0% 0% 0%
[libx264 @ 000001e6f6d57100] Weighted P-Frames: Y:0.0%
[libx264 @ 000001e6f6d57100] ref P L0: 96.6% 0.7% 1.3% 1.3%
[libx264 @ 000001e6f6d57100] ref B L0: 96.9% 2.1% 1.0%
[libx264 @ 000001e6f6d57100] ref B L1: 94.8% 5.2%
[libx264 @ 000001e6f6d57100] kb/s:227.72
[AVIOContext @ 000001e6f6ccb880] Statistics: 32768 bytes read, 0 seeks
最佳答案
您的输入图像只有一个分量 channel - 亮度。大多数播放器处理包含三个分量 channel 的 H.264 流 - 亮度或“亮度”(Y)和两个用于色度或“颜色”(U 和 V)。当 H.264 编码器对仅 luma 流进行编码时,它会使用许多播放器无法很好处理的语法来存储它。因此,我们告诉 ffmpeg 在将其发送到编码器之前添加具有中性值的色度分量(因为源中没有色价)。我们将添加最常见的 YUV 编码形式 - yuv420p。
所以,
ffmpeg -y -loop 1 -framerate 30 -t 5 -i SplashBW.jpg -pix_fmt yuv420p Splash.mp4
关于FFMPEG - 视频中带有 Splash 图像的绿色转换,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62097328/
在此处下载源代码:http://www.eyeClaxton.com/download/delphi/ColorSwap.zip 是的,我想将“主要是蓝色”的内容转换为“主要是绿色”的内容。 我想获取
我正在处理红色、绿色、蓝色或黑色的小图像(想想 4 色卡组中的卡片等级)。什么是确定图像颜色的快速算法? 有关输入的示例集,请参阅 here ,除了图像可以缩放等,所以它们不会那么清晰。 最佳答案 这
我正在为我的 HTML 表单创建一个简单的 JS 验证。验证检查字段是否为空,在某些情况下检查两者,如果它们为空并输入 !numbers。此检查效果很好,但我还试图实现的是,如果 JS 检测到无效输入
我是 Mac OSx/Cocoa 开发新手。在创建我的第一个应用程序期间,我遇到了一些事情,其中之一就是用于缩放目的的绿色 + 按钮的问题。 我想知道是否可以动态设置应用程序窗口的缩放按钮的行为?
我正在尝试通过command line构建apk gradlew assemleDebug 但出现以下错误: Could not find tools.jar. Please check that C
我有这段代码可以生成一个可点击的框,只要单击鼠标,它就会通过在绿色阴影之间循环来改变颜色,从黑色 --> 绿色 --> 白色。我需要同样的事情发生,除了盒子不是逐渐变亮,而是从白色开始逐渐变暗。 va
我正在构建一个 ruby on rails 应用程序,并尝试启动我的 TDD。我在测试环境下安装了以下 gem。 turn <0.8.3 rspec-rails capybara guard-rs
我的程序读取形状列表,如果面积 > 1000 并且颜色字符串与绿色匹配,则打印形状。 下面的示例数据: 矩形,宽度,高度,颜色 - 圆、半径、颜色。 矩形 68.01 77.63 橙色 主类(clas
我有以下代码: from PIL import Image import numpy as np a = np.ones((512, 256, 3)).astype(int)*255 image =
我正在尝试学习 TDD 和单元测试概念,并且我看到了口头禅:“红色、绿色、重构”。我很好奇为什么要在测试通过后重构代码? 这对我来说毫无意义,因为如果测试通过了,那你为什么要弄乱代码?我还看到 TDD
首先,我必须解释一下,我知道如果您的应用程序支持 CallKit 并且用户从应用程序进入后台状态,就会出现这个绿色条,而这些都可以在我的 VOIP 应用程序中完美运行。 但我想实现类似 Whatsap
有没有办法轻松地将给定的十六进制颜色代码分配给更一般的类别(红色、绿色、蓝色、黄色、橙色、粉色、黑色、白色、灰色……)? 比如 #ffcc55 -> 橙色,#f0f0f0 -> 白色,... 编辑:甚
Parameterized Unit Testing当您有 X 单元测试 * Y 配置时非常棒。 我有 3 个单元测试,每个单元测试都必须在 5 个特定情况下运行。 我使用 xUnit.net 的 T
我想实现一个可以按颜色过滤图像的搜索。我的图像模型包含多达 10 个出现在该特定图像中的 UIColors,现在我想要一个过滤器,例如蓝色,绿色,红色,黄色。我如何检查(以指定的容差)该特定图像是否包
我使用的是OpenCV 2.4.1,需要检测视频流是否有任何噪音。噪声,例如如下所示的样本帧: 一种检测这些类型的噪声的简单,快捷的方法可能是。问题是这种噪声可能是间歇性的,不可预测的并且需要检测 最
这个问题在这里已经有了答案: UIColor colorWithRed:green:blue:alpha: always returns white unless one argument is
我希望使用非常明亮的金属色或荧光色来指定我的文本和 div 颜色。我还没有找到显示这些的任何标准。这些是否存在于颜色规范中,或者您能否向我推荐任何接近的尝试。谢谢。 最佳答案 Here's一个很好的荧
Matlab 将图像存储为 3 维数组。前两个维度对应上图轴上的数字。每个像素由图像三维中的三个条目表示。三层中的每一层都代表像素阵列中红色、绿色和蓝色的强度。我们可以通过以下方式提取出图像中独立的红
我有一个图像(列表列表),我想返回整个图像的平均颜色。我尝试使用 zip() 将图像按红、绿、蓝切成 3 部分,但是当我运行代码时: def average(image): """Return
为什么我在 SSL 锁定标志前看到一个带有 Twitter Inc 的绿色方 block ,但对于 Facebook 来说只是一个简单的锁定标志? 这些证书有什么区别?还是有其他原因? 最佳答案 绿色
我是一名优秀的程序员,十分优秀!